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Everett Rubel

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Everett Rubel submitted Solution 154556 to Problem 76. De-dupe

on 26 Oct 2012

Everett Rubel submitted a Comment to Problem 986. Penny Flipping: Reverse subsets of a sequence of coins until you recover the original configuration

Jean-Marie: The transformation between steps 2 and 3 (1 0 0 -> 1 1 0) is the same as for the one between steps 8 and 9; we are working with the entire stack of 3 coins. The first/top coin exchanges with the last/bottom coin and then all coins change their orientation.

on 25 Oct 2012

Everett Rubel submitted a Comment to Problem 986. Penny Flipping: Reverse subsets of a sequence of coins until you recover the original configuration

Jean-Marie: I think the phrase, "invert the substack" is the issue. For me, this means to take the substack and invert it as a unit. The coins exchange positions in the substack as well as inverting their values. It is a single physical action that translates into two separate operations on the coins. I may have done better to write, "flip the substack as a unit."

on 18 Oct 2012

Everett Rubel submitted a Comment to Problem 42. Find the alphabetic word product

For the bonus question, we can rule out any number that has a prime factor greater than 26 (z). The product found by Jason Friedman is the first number greater than 10^6 that does not have such a prime factor. The product 999856 is the largest number less than 10^6 to be part of a possible solution.

on 14 Oct 2012
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